21001221001202 has 16 divisors (see below), whose sum is σ = 33929028212352. Its totient is φ = 9691734402000.

The previous prime is 21001221001169. The next prime is 21001221001207. The reversal of 21001221001202 is 20210012210012.

It is not an unprimeable number, because it can be changed into a prime (21001221001207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47141924 + ... + 47585327.

It is an arithmetic number, because the mean of its divisors is an integer number (2120564263272).

Almost surely, 2^{21001221001202} is an apocalyptic number.

21001221001202 is a deficient number, since it is larger than the sum of its proper divisors (12927807211150).

21001221001202 is a wasteful number, since it uses less digits than its factorization.

21001221001202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94735793.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001221001202 its reverse (20210012210012), we get a palindrome (41211233211214).

The spelling of 21001221001202 in words is "twenty-one trillion, one billion, two hundred twenty-one million, one thousand, two hundred two".